IIST Sample Papers With Solutions

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The proximate standard enthalpies of formation—–
Ms H (octane) is more negative than H (methano’)

Sol: Combustion of C8H involves more number of carbons and hycirogens compared to CI-L,O

The Boyle temperatures of three gases are–— ns: I-hydrogen, Il-oxygen, Ill-ethene
Sol: More the compressibihty factor greater is the negative deviation from ideal behaviour.

For bromoal kanes——A
ns:I and III
Sol: Statements I and III are correct

The stability order of the following carbocation isA ns:ll > Ill > I> IV
Sol: II is the most stable carbocation because positive charge is at allylic position with respect to two double bonds.
IV is the least stable carbocation as it is antiaromatic

For bromoalkanes------
Ans : I and III
Sol: Statements I and III are correct

The number of unpaired electrons present ------Ans : 0 and 4

Sol: [Co(C2O4)3]

3−is a spin paired complex with d 2sp 3 hybridisation where as [CoF6]
3− is a spin free complex with sp3 d2 hybridisation

The correct statement regarding the functioning
of a catalyst is that it------
Ans : II and IV
Sol: Statements II & IV are correct

The relationship among the following pairs of
isomers is------
Ans : I −A, II −A, III −B, IV −B
Sol: Geometrical and optical isomers are
known as configurational isomers


37. The compounds that form stable hydrates are-----
Ans : II and IV
Sol: II is Indane-1,2,3-trione. It forms a stable
hydrate known as ninhydrin which is
stabilized by intramolecular hydrogen
bonding. IV is chloral which also forms
stable chloral hydrate

For a real number x, let [x] denote the greatest
integer less than or equal to x------
Ans : one −one but NOT onto







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